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• Android receive RTP/UDP audio stream from VLC/ffmpeg

  23 mai 2016, par Dom4S

  I was searching for a good answer for half a day, but I am a beginner at this stuff and I would appreciate any help.

  What I would like to achieve is to stream audio (mp3 files) within ffmpeg or vlc and receive it on an Android device by udp/rtp.

  This is what I was able to figure out myself sofar :

  1) There is Android class AudioStream and RTPStream. What I don’t know is how to use it. For example I create a stream via ffmpeg with : ffmpeg -re -i mymp3.mp3 -ar 8000 -acodec copy -f rtp rtp://192.168.0.100:5533, where 192.168.0.100 is the address of my Android device. Now I would like to receive it and play it.

  I found something like this on Stack :

  AudioStream audioStream;
  
  AudioGroup audioGroup;
  
  AudioCodec codec = AudioCodec.PCMU;
  
  StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitNetwork().build();
  
  StrictMode.setThreadPolicy(policy);
  
  AudioManager audio = (AudioManager)getSystemService(AUDIO_SERVICE);
  
  audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
  
  audioGroup = new AudioGroup();
  
  audioGroup.setMode(AudioGroup.MODE_NORMAL);
  
  InetAddress inetAddress;
  
  try {
  
      inetAddress = InetAddress.getByName("163.11.62.208");
  
      audioStream = new AudioStream(inetAddress);
  
      audioStream.setMode(RtpStream.MODE_RECEIVE_ONLY);
  
      audioStream.setCodec(codec);
  
      InetAddress inetAddressRemote = InetAddress.getByName("163.11.169.206");
  
      audioStream.associate(inetAddressRemote, 5004);
  
      audioStream.join(audioGroup);
  
  }

  What is the first inetAddress 163.11.62.208 and what is the second one 163.11.169.206 ? Shoudln’t I just give an address of a stream ?

  2) Can I submit only streams in PCMU format ? Can I stream mp3 files ?

  3) Is it even possible ?

• FFMPEG : Using av_write_frame AFTER av_write_trailer

  20 mars 2024, par Aleksei Komarov

  I'm using avio_alloc_context with my own "write_buffer_proc" to override file i/o.
I am trying to continue writing the stream with av_write_frame AFTER av_write_trailer was called.
But av_write_trailer has some strange side effects.

  


  The result is AV in module 'avformat-58.dll' (Read of address 0000000000000090)
I think that FormatContext becomes invalid after av_write_trailer.
How Can I fix it ?
Can I try to save FormatContext somewhere before calling av_write_trailer ?

  


• Error : "from : can't read /var/mail/moviepy.editor" How to resolve ?

  23 mai 2017, par batman_rising

  I have a script using which I am editing a video, (extracting 10 clips from a video and then simply concatenating them), I am using moviepy python module as well as ffmpeg

  The script works perfectly when I run it from terminal,

  Now I wanted to run the same script on startup, so I added a path in /etc/rc.local
sudo python /home/startlord/myProject/run.py but the code doesn’t work.

  also, I tried another approach,
  sudo nano /etc/init.d/testRun and created the script executable sudo chmod 755 /etc/init.d/testRun
  but when I wanted to start the execution sudo /etc/init.d/testRun start I was getting this error

  from : can’t read /var/mail/moviepy.editor

  what should I do now ! I am using UP-board, please help, I am not from computer science background.